:root {
    --main-color: #1E3A8A;
    --accent-color: #FF7800;
    --background-gradient: linear-gradient(135deg, #63BCE9 0%, #824EBD 100%);
    --text-color: #ffffff;
    --module-bg: rgba(255, 255, 255, 0.1);
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    --border-radius: 12px;
  }

  @font-face {
    font-family: 'Helvetica Neue';
    src: local('Helvetica Neue'), local('HelveticaNeue');
  }

  * {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }

  body {
    background: var(--background-gradient);
    color: var(--text-color);
    font-family: 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 40px 60px;
  }

  .design-notice {
    position: fixed;
    top: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    padding: 10px 15px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 1001;
    backdrop-filter: blur(5px);
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
  }

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 58, 138, 0.9);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  }

  .nav-links {
    display: flex;
    gap: 30px;
  }

  .nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    position: relative;
    transition: all 0.3s ease;
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: width 0.3s ease;
  }

  .nav-links a:hover {
    color: var(--accent-color);
  }

  .nav-links a:hover::after {
    width: 100%;
  }

  article {
    background: rgba(255,255,255,0.05);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(5px);
  }

  h2 {
    font-size: 32px;
    margin-bottom: 30px;
    color: white;
    position: relative;
    padding-bottom: 15px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: var(--accent-color);
    border-radius: 3px;
  }

  h3 {
    font-size: 24px;
    margin: 40px 0 20px;
    color: white;
  }

  p {
    margin-bottom: 20px;
    font-size: 17px;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .decorative-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .decorative-img:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0,0,0,0.3);
  }

  pre {
    background: rgba(0,0,0,0.3);
    padding: 20px;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin: 25px 0;
    font-family: 'Courier New', monospace;
    font-size: 15px;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--accent-color);
    color: white;
    padding: 5px 10px;
    border-radius: 0 var(--border-radius) 0 var(--border-radius);
    font-size: 14px;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0,0,0,0.2);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 15px;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(255,255,255,0.05);
    border-radius: var(--border-radius);
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  th {
    background: rgba(30, 58, 138, 0.5);
    font-weight: 600;
  }

  tr:hover {
    background: rgba(255,255,255,0.05);
  }

  .module {
    background: var(--module-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    margin-bottom: 40px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
  }

  .module:hover {
    transform: translateY(-5px);
  }

  .primary-btn {
    display: inline-block;
    background: var(--accent-color);
    color: white;
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 120, 0, 0.3);
  }

  .primary-btn:hover {
    background: #e06700;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 120, 0, 0.4);
  }

  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  @media (max-width: 768px) {
    .container {
      padding: 80px 20px 40px;
    }
    
    .navbar {
      padding: 15px 20px;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px 20px;
    }
    
    h2 {
      font-size: 28px;
    }
    
    h3 {
      font-size: 22px;
    }
  }

  @media (max-width: 480px) {
    .image-grid {
      grid-template-columns: 1fr;
    }
    
    .nav-links {
      display: none;
    }
  }